Characteristics of the first 1119 SARS-CoV-2 Omicron variant cases, in Marseille, France, November-December 2021.

One thousand one hundred and nineteen cases of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron variant cases have been diagnosed at the Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France, between November 28, 2021, and December 31, 2021. Among the 825 patients with known vaccination status, 383 (46.4%) were vaccinated, of whom 91.9% had received at least two doses of the vaccine. Interestingly, 26.3% of cases developed SARS-CoV-2 infection within 21 days following the last dose of vaccine suggesting possible early production of anti-SARS-CoV-2 facilitating antibodies. Twenty-one patients have been hospitalized, one patient required intensive care, and another patient who received a vaccine booster dose died.